What makes the S54 powerplant unique?
The S54 engine used in the E46 M3 is the ultimate and final evolution of the iron-block S50 inline-6 that powered the European-spec versions of the E36 M3. Though derived from the 3.2-liter S50 B32 unit, the S54 features the following enhancements: -Increased cylinder bore to 87mm (from 86.1mm) for a new total displacement of 3,246cc -Modified camshafts -High pressure Double VANOS continuously variable valve timing system with faster operation at high rpm -Increased compression to 11.5:1 (from 11.3:1) -Advanced BMW/Siemens MSS 54 engine management control -Electronic throttle activation with two M Dynamic Driving Control response modes -Finger-type rocker arms for reduced reciprocating mass and friction -One-piece aluminum head casting for lighter weight -Scavenging oil pump to maintain pressure during heavy cornering The S54 engine in the E46 M3 is rated at 343 hp (DIN) or 333 hp (SAE) at 7,900 rpm and 262 lb/ft of torque at 4,900 rpm.
